Don't handle the vase as if it ________made of steel.
A．isB．wereC．has beenD．had been
B
考察虛擬語氣。As if后面的句子如果表示的是假的事情，則使用虛擬語氣。與現(xiàn)在將來相反，用過去時，be動詞用were；與過去相反，則使用過去完成時。根據(jù)句意可知本題是表示與現(xiàn)在相反，故使用were；句意：不要那樣放花瓶，好像它是鐵做的一樣。故B正確。
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